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LIO target is a full featured in-kernel target framework with the
following feature set:
High-performance, non-blocking, multithreaded architecture with SIMD
support.
Advanced SCSI feature set:
* Persistent Reservations (PRs)
* Asymmetric Logical Unit Assignment (ALUA)
* Protocol and intra-nexus multiplexing, load-balancing and failover (MC/S)
* Full Error Recovery (ERL=0,1,2)
* Active/active task migration and session continuation (ERL=2)
* Thin LUN provisioning (UNMAP and WRITE_SAMExx)
Multiprotocol target plugins
Storage media independence:
* Virtualization of all storage media; transparent mapping of IO to LUNs
* No hard limits on number of LUNs per Target; maximum LUN size ~750 TB
* Backstores: SATA, SAS, SCSI, BluRay, DVD, FLASH, USB, ramdisk, etc.
Standards compliance:
* Full compliance with IETF (RFC 3720)
* Full implementation of SPC-4 PRs and ALUA
Significant code cleanups done by Christoph Hellwig.
[jejb: fix up for new block bdev exclusive interface. Minor fixes from
Randy Dunlap and Dan Carpenter.]
Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
41 lines
908 B
C
41 lines
908 B
C
#ifndef TARGET_CORE_IBLOCK_H
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#define TARGET_CORE_IBLOCK_H
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#define IBLOCK_VERSION "4.0"
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#define IBLOCK_HBA_QUEUE_DEPTH 512
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#define IBLOCK_DEVICE_QUEUE_DEPTH 32
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#define IBLOCK_MAX_DEVICE_QUEUE_DEPTH 128
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#define IBLOCK_MAX_CDBS 16
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#define IBLOCK_LBA_SHIFT 9
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struct iblock_req {
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struct se_task ib_task;
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unsigned char ib_scsi_cdb[TCM_MAX_COMMAND_SIZE];
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atomic_t ib_bio_cnt;
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atomic_t ib_bio_err_cnt;
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struct bio *ib_bio;
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struct iblock_dev *ib_dev;
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} ____cacheline_aligned;
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#define IBDF_HAS_UDEV_PATH 0x01
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#define IBDF_HAS_FORCE 0x02
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struct iblock_dev {
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unsigned char ibd_udev_path[SE_UDEV_PATH_LEN];
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int ibd_force;
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int ibd_major;
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int ibd_minor;
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u32 ibd_depth;
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u32 ibd_flags;
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struct bio_set *ibd_bio_set;
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struct block_device *ibd_bd;
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struct iblock_hba *ibd_host;
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} ____cacheline_aligned;
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struct iblock_hba {
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int iblock_host_id;
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} ____cacheline_aligned;
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#endif /* TARGET_CORE_IBLOCK_H */
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